Is a super-intelligence limited by the intelligence of its creator?
Of course the intelligence of a product is limited by the intelligence of its creator. Just not to the intelligence of its creator. 

That would be about as reasonable as the idea that the speed of a car is limited to the speed of its creator. 

Or the playing strength of a chess program to the Elo of its creator.

Or the ability of a neural network to differentiate between dozens of dog breeds to the dog expertise of its creator.

So, not very reasonable.